President Donald Trump, left, Maj. Gen. Michael L. Howard, commanding general of Joint Force Headquarters-National Capital Region and the Military District of Washington, center, and Secretary of Defense Jim Mattis participate in a Memorial Day wreath laying ceremony at Arlington National Cemetery, Monday, May 28, 2018, in Arlington, Va. (AP Photo/Evan Vucci)
"These are some of our Marines buried here," said U.S. Marine Sergeant Major Darrell Carver of the 6th Marine Regiment as he walks among the graves of U.S. soldiers, most of them killed in the World War I Battle of Belleau Wood, during a ceremony to commemorate the 100th anniversary of the battle on Memorial Day at the Aisne-Marne American Cemetery on May 27, 2018 near Chateau-Thierry, France. Nearly 100 years before, U.S. soldiers, including Marines from the 6th Regiment, repelled repeated assaults from a German advance at Belleau Wood only 60 miles from Paris. The U.S. suffered approximately 10,000 casualties in the month-long battle, including nearly 2,000 dead. Today the Battle of Belleau Wood is central to the lore of U.S. Marines. (Photo by Sean Gallup/Getty Images)
Aerographer's Mate 2nd Class Leo Kalaitzidis high fives a child during the Staten Island Fleet Week Memorial Day Parade. (MC Roger S. Duncan/Navy)
Vietnam veterans search for names on the Vietnam War Memorial as thousands of bikers and military veterans take part in the 31st annual Rolling Thunder Ride for Freedom motorcycle parade in Washington D.C. (ERIC BARADAT/AFP/Getty Images)
U.S. Naval Academy midshipmen raise their right hands as they are commissioned as second lieutenants in the U.S. Marine Corp during the Academy's graduation and commissioning ceremony, Friday, May 25, 2018, in Annapolis, Md. (AP Photo/Patrick Semansky)
Marine Corps Commandant Gen. Robert Neller drinks from Bulldog Fountain after a ceremony at the Aisne-Marne Cemetery, Belleau, France. The ceremony honored the 100th anniversary of the Battle of Belleau Wood during World War I. (Sgt. Olivia G. Ortiz/Marine Corps)
Naval Academy midshipmen cheer as the Navy's Blue Angels fly over the graduation ceremony in Annapolis, Maryland. (JIM WATSON/AFP/Getty Images)
NAUGATUCK, CT - MAY 28: People watch as soldiers march through the streets of Naugatuck in the annual Memorial Day Parade on May 28, 2018 in Naugatuck, Connecticut. Across America, towns and cities will be remembering those who lost their lives while serving in the United States Armed Forces. Memorial Day is a federal holiday in America and has been celebrated since the end of the Civil War. (Photo by Spencer Platt/Getty Images)
Navy Diver 2nd Class Trey Crane, assigned to Mobile Diving and Salvage Unit (MDSU) 2, poses for a selfie with visitors at the New York Aquarium during Fleet Week New York (FWNY) 2018. (MC2 Charles Oki/Navy)
180523-N-ZJ713-160 NEW YORK (May 23, 2018) Sailors and Marines aboard USS Arlington (LPD 24) man the rails upon entry into New York City to celebrate Fleet Week New York (FYNY). Now in its 30th year, Fleet Week New York is the city’s time-honored celebration of the sea services. (MC3 Jake Stanley /Navy)
West Point cadets Camiesha Jackson, right, and Courtney Smith hug during graduation ceremonies at the United States Military Academy, Saturday, May 26, 2018, in West Point, N.Y. (AP Photo/Julie Jacobson)
West Point graduates toss their caps into the air at the end of graduation ceremonies at the United States Military Academy, Saturday, May 26, 2018, in West Point, N.Y. (AP Photo/Julie Jacobson)
A young boy collects covers after the United States Naval Academy graduates celebrated by throwing their covers into the air during a ceremony in Annapolis, Maryland on May 25, 2018. (JIM WATSON/AFP/Getty Images)
U.S. Marine Corps and Navy veterans observe the 5th Marines Vietnam War Memorial during the unveiling ceremony in the Camp San Mateo Memorial Garden at Marine Corps Base Camp Pendleton, Calif., May 28, 2018. The memorial is inscribed with the names of 2,706 Marines and sailors who gave their lives serving our great nation. (Lance Cpl. Rhita Daniel/Marines)
This Sunday, May 27, 2018, photo provided by Eternal Reefs shows a part of the On Eternal Patrol Memorial Reef in Sarasota, Fla., that will be installed on the ocean floor about 9 miles off the coast of Sarasota. The monument will honor more than 4,000 officers and crew members who have died while serving aboard American military submarines since 1900. Subtropical Storm Alberto’s crossing of the Gulf of Mexico delayed the installation of the first ball Monday. (LSK Drones/EternalReefs.com via AP)
Soldiers from the 82nd Airborne are carried away by a helicopter during a pre-race military salute before the NASCAR series auto race at Charlotte Motor Speedway in North Carolina. (Mike McCarn/AP)